Doesn't it strike you as odd that the Pres., Sec. Def. and the Chairman of the Joint Chiefs of Staff, all of whom would have each been immediately notified, would continue their meeting and simply be "apprised" of an ongoing attack of unprecedented scale on a U.S. embassy?
A situation that would require a president's order to respond to and would require the knowledgeable input of the Sec. Def and Chairman of the Joint Chiefs of Staff. They weren't even curious to use the resources at hand to watch an unprecedented attack on an embassy outpost? I hate to think what it would take to peak their interest.
Someone gave the order to send in the drone.